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The time (in seconds) that a random sample of employees took to complete a task is as follows:
63
229
165
77
49
74
67
59
66
102
81
72
59
74
61
82
48
70
86
a. Plot a stem & leaf diagram
b. Compute the arithmetic mean, mode, median and quartiles
c. Compute 80th percentile
d. Compute the variance and standard deviation
e. Compute coefficient of variation
f. Construct a box-plot for the data. Is the data skewed, explain? Identify any outliers in the data
To break even in a manufacturing business, income or revenue R must equal the cost of production C. The cost C to produce x skateboards is c=63+22x. The skateboards are sold wholesale for $25 each, so revenue R is given by R=25x Find how many skateboards the manufacturer needs to produce and sell to break even. (Hint: Set the cost expression equal to the revenue expression and solve for x.)
The average annual number of cigarettes smoked by an adult in some country continues to decline. For the years 2000-2012 the equation y=-77.8x+2051 approximates this data. Here, x is the number of years after 2000, and y is the average annual number of cigarettes smoked. If this trend continues, find the year in which the average annual number of cigarettes smoked reaches zero. To do this, substitute 0 for y in the equation and solve for x.
Find the value of the following expression for the given values.
n^2-m^2;n=-3 and m=-7
A university president's salary for the 2012-2013 academic year was $470,000 Calculate his 2013-2014 salary if he received a 2.7% raise.
The first aircraft has 54 more seats than the second aircraft. The third aircraft has 58 fewer seats than the second aircraft. If their total number of seats is 389. find the number of seats for each aircraft.
(Simplify your answer.)
In the last year, a total of 15,456 earthquakes occurred in a country. Of these 88.7% were minor tremors with magnitudes of 4.9 or less on the Richter scale. How many minor earthquakes occurred in the country in the last year?
(Round to the nearest whole number.)
Semi-annual payment of 12,000.00 for twelve (12) years that will start from now. What is the period of deferral?
Payment of 400.00 every 5 months for 3 years that start at the end of 5 years. What is the period of deferral?
Payment of 7,000.00 every month for one (1) year that will start at the end of the third month. What is the period of deferral?
